Bypass valve



FIG. 1 is a right side elevational view of a bypass valve embodying my new design, the left side being a mirror image of the right side as shown;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a bypass valve, as shown and described. 